JPS5923022A - Valve stopping device for variable displacement type engine - Google Patents

Abstract

PURPOSE:To enable the valve stopping device to respond quickly for switching the operation of a valve by a method wherein a pressure oil in a high pressure chamber of an oil pressure tappet is opened to thereby release the oil into a low pressure chamber and at the same time, the pressure oil is discharged from the low pressure chamber through a throughhole. CONSTITUTION:The fulcrum of rocking of a rocker arm 21 is supported on a housing 11 through a bracket 19 and the oil pressure tappet. When a cylinder reduction switch 59 is closed, and electromagnetic mechanism 53 is excited and a rod 63 is lowered so that a check valve 51 is opened. At the same time, the throughhole 41 communicating with the low pressure chamber 29 is opened due to the existence of a concave section 65 of the rod 63. As a result, the discharge of the pressure oil from the high pressure chamber 27 into the low pressure chamber 29 is made quickly so that the variable control of the oil pressure is not required and the switching between the operation and the non-operation of the valve is performed quite quickly.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a variable displacement engine that can change the number of operating cylinders of the engine. This invention relates to a valve stop device that reduces the load on the engine.

In general, variable displacement engines reduce fuel consumption by reducing the number of cylinders to which fuel is supplied depending on the engine operating conditions, reducing the operating displacement and also stopping the operation of the valves corresponding to the cylinders to which fuel supply has been stopped. It is widely known to reduce

Traditionally, valve stop devices for dual variable displacement engines have divided the tappet into upper and lower halves, applied hydraulic pressure between them to ensure normal operation, and then released the hydraulic pressure to disable the tappet. There was a hydraulic tappet type.

However, in the conventional hydraulic tappet type mentioned above, since the tappet is activated or deactivated by controlling the pump oil pressure, various parts must be incorporated to make the discharge pressure variable. However, it had the disadvantage of poor assembly workability.

In addition, the hydraulic tappet type mentioned above has the function of activating and deactivating the intake and exhaust valves, but when the above-mentioned hydraulic pressure is released and the tappet is deactivated, the pressure oil is released. The disadvantage was that the through holes were too small, allowing pressure oil to escape. However, when supplying pressure oil, the above-mentioned through hole
Since the pressure must not be small in order to raise the oil pressure, it is desirable to have something that resolves this contradiction and becomes small when pressure oil is supplied and becomes large when pressure oil is released.

This invention was devised by focusing on such conventional problems, and its purpose is to enable and disable the operation and deactivation of intake and exhaust valves without the need for a variable discharge pressure pump or the like.
In addition, it provides a valve stop device for an 11-displacement variable displacement engine that can quickly switch the intake and exhaust valves into operation and non-operation states.1.The present invention achieves two objects. Through the rocker arm, it is swingably supported on the bracket.
This is a valve operating mechanism for a valve stop device that opens and closes intake and exhaust valves, in which a sleeve with a concave cross section is buried in a housing installed at the top of the cylinder head, and a sleeve with a concave cross section is embedded in the sleeve at the upper end of the bracket. A fixed sliding body with a concave cross section is inserted so as to be able to rise and fall freely, and a high pressure chamber and a low pressure chamber provided with a pressure oil supply/discharge port are defined through a plunger provided with an orifice passage inside the sliding body. A check ball that is always energized in the direction of closing the orifice passage is installed in the chamber, and a rod that is operated by an electromagnetic mechanism to press the check ball is provided in the low pressure chamber, and is connected to a power source, and the rod is connected to the electromagnetic mechanism. When the passage is closed by this cylinder reduction switch, the electromagnetic mechanism is energized to press the check ball via the rod, and the pressure oil in the high pressure chamber is diverted to the low pressure chamber side. At least one of the through hole formed in the sleeve and the rod inserted through the through hole is provided with a mechanism for shutting off the pressure oil flowing through the through hole. This is a summary of what has been constructed.

Hereinafter, embodiments of the present invention will be described based on the drawings.

In FIG. 1, the cams C, 11 and the cam 5 of the camshaft O are supported by the cylinder spatula l-1, and the intake and exhaust valves 7 are inserted into the cylinder spatula l-1 while being biased upwardly by the springs 9. .

A housing 11 is provided in the "-1" part of the cylinder head 1.
is fixed thereto, and a sleeve 15 having a concave cross section is embedded in a hole 13 formed on the lower side of the housing 11.

A sliding body 17 having a concave cross section is fitted inside the sleeve 15 so as to be able to rise and fall freely, and a rocker arm 21 is pivotally supported at the end of a bracket 19 that is integrally attached to the lower part of the sliding body 17. has been done.

Both ends and the lower surface of the rocker arm 21 are in contact with the two-part cam 5 and the suction air valve 7, and an orifice passage 23 is bored in the lower part of the inside of the sliding body 17. A plunger 25 is slidably fitted, and defines an upper low pressure chamber 27 and a lower high pressure chamber 29.

A supply port 67 connected to the pump 65 connected to the oil pan 66 via a passage 61 is provided on the side wall of the sleeve 15 of the high pressure chamber 29, and a discharge passage 690 and a through hole 41 are provided on the sleeve 15''. It is perforated.

Note that the upward bias of the granger 25 by a spring 46 interposed on the lower side is locked by a spacer 45 interposed above it.

Several net-like spring holders 47 are installed in the lower part of the plunger 25, and the spring holders 47 are energized by a spring 49 to open the orifice passage 26.
A solenoid 53 as an electromagnetic mechanism is screwed into the housing 11 on the upper side of the sleeve 15, and this solenoid 53 operates as an on-off valve interposed in the passage 31. A cylinder reduction switch 59 connected to an electromagnetic cutoff valve 55 and a power source 57
A connection line 61 is used to connect between the two.

A rod 63 is installed inside the solenoid 56 so as to be able to move up and down. In the 3° double configuration, a four part 65 as a blocking mechanism is formed on the outer periphery of the rod 66 that passes through the through hole 41 at a position relative to the through hole 41 when pressing the Guek ball 51 of the womb rod 66. First, during normal operation of the engine, the engine oil in the oil pan 66 passes through the pump filter 5 and pushes down the check ball 51 of the high pressure chamber 29 and fills the high pressure chamber 29. The check ball 51 closes the orifice passage 23 due to the pressure difference with the low pressure chamber 27 from which oil is discharged.

Therefore, when the engine is driven and the cam 5 rotates in the above-mentioned state, the cam 5 is closed via the high pressure chamber 29.

Next, for example, when the load on the engine decreases and the cylinder reduction switch 59 is turned on, the electromagnetic cutoff valve 55 is activated and closed, cutting off the oil supply to the pump 65 and energizing the solenoid 56. As shown in FIG. 3, the rod 66 descends against the spring 67 and pushes down the check ball 51, causing the high pressure chamber 29 and the low pressure chamber 27 to communicate through the orifice passage 26, and the through hole 41 is opened by the recess 65 of the rod 66. Make it bigger.

Then, when the cam 5 rotates and the rocker arm 21 is pushed up as shown by the chain line in Figure 1, the bracket 1
When the sliding body 17 is pushed and kicked through the valve 9, the oil passes from the high pressure chamber 29 to the low pressure chamber 27, and is discharged from the saw through hole 41, which is wider than when the intake and exhaust valve 7 is operated, with a small passage resistance. Since the cam 5 reliably absorbs the vertical movement of the rocker arm 21, the intake and exhaust valves 7 do not operate.

In the embodiment shown in FIG. 4, the V-seat 63a has a blocking plate 69 as a blocking mechanism inside the sleeve 15.
The flow cross-sectional area of the through hole 41, which is reduced by the blocking plate 69 when the Londro 3& is activated, becomes larger when the blocking plate 69 moves downward. In the embodiment shown in , Londro 3b
In this case, the inside of the sleeve 15 has a large diameter as a blocking mechanism.
The upper side of the protrusion 71 normally narrows the sleeve 15 side of the through hole 41, and the rod 63b
The υ1.1'1 through hole 41 is cut so that the flow cross-sectional area thereof becomes large during operation.

Furthermore, FIG. 6 shows that the insertion part of the rod 63c through the through hole 41 is formed thicker than other parts as a large diameter part 76 serving as a blocking mechanism, and when the rondro 3c is operated, the arad 63c
When the is lowered, the small diameter part 75 is located in the insertion part of the through hole 41,
Although the flow cross section of the through hole 41 is enlarged 1, in the embodiment shown in FIG. 7, the sleeve 15a
A part of the upper surface is formed as a valve 77 as a shutoff mechanism, and this valve 77 is normally biased in the closing direction by a spring 79.
is formed, and the rondro 3d is inserted.

In this embodiment, when the Londro 3d is pushed down, the ring 81 mounted on the Londro 3d is moved by the spring 7.
9 to open the valve 77, the flow cross-sectional area is significantly increased, and the oil is smoothly discharged without resistance.

As described above, the present invention is a valve operating mechanism for a valve stop device that opens and closes intake and exhaust valves via a rocker arm swingably supported by a bracket, and the invention is a valve operating mechanism for a valve stop device that opens and closes intake and exhaust valves through a rocker arm that is swingably supported by a bracket. A sleeve with a concave cross section is embedded, and a sliding body with a concave cross section fixed to the upper end of the bracket is inserted into the sleeve so as to be able to move up and down, and an orifice passage is provided inside the sliding body. and a low pressure chamber with a pressure oil supply and discharge port, and the high pressure chamber is equipped with a check ball that is always energized in the direction of closing the orifice passage, and the low pressure chamber is equipped with an electromagnetic mechanism. a rod that is actuated and presses the check ball, and a cylinder reduction switch that is connected to a power source and controls energization and de-excitation of the electromagnetic mechanism, and when the passage is closed by the cylinder reduction switch,
The electromagnetic mechanism is energized to press the check ball via the rod, and the pressure oil in the high pressure chamber is directed to the low pressure chamber side, and the sleeve is inserted into the through hole formed in the sleeve. By providing a cutoff mechanism for the pressure oil flowing through the through hole on at least one of the rods, it is not necessary to provide various devices to vary the pump discharge pressure as a variable displacement engine. Furthermore, it has the excellent effect of quickly discharging pressure oil from the through hole and ensuring smooth operation and switching of the intake and exhaust valves.

[Brief explanation of drawings]

FIG. 1 is an explanatory cross-sectional view of the entire valve stop device according to an embodiment of the present invention, and FIGS. 2 and 3 are enlarged cross-sectional views of main parts, respectively.
4, 5, and 6.7 are partial cross-sectional views of the rond portion showing other embodiments, respectively. 1... Cylinder head, 7... Intake and exhaust valve, 11...
・Housing, 15...Sleeve, 17...Sliding body, 19...Bracket, 21...Rocker arm,
26... Orifice passage, 25... Plunger, 2
7...Low pressure chamber, 29...High pressure chamber, 31... Passage,
33... Oil pan, 67... Supply port, 41...
Through hole, 51...Check ball, 53...Solenoid, 55...Solenoid cutoff valve, 59...Cylinder reduction switch, 61...Connection line "163, 63a. 63b, 6'3ct 63d"'Rod, 65・
... recess, 69 ... blocking plate, 71 ... protrusion,
76...Large diameter section, 77...Valve. Agent: Patent Attorney Makoto Ogawa − Patent Attorney: Ken Noguchi Patent Attorney: Kazuhiko Saishita

Claims (1)

[Scope of Claims]] A valve operating mechanism for a knob stop device that opens and closes an intake valve via a rocker arm swingably supported by a bracket, which is attached to a part of a cylinder head. A sleeve with a concave cross section is buried in the housing, and a sliding body with a concave cross section fixed to the upper end of the bracket is inserted into the sleeve so as to be freely slidable.
Inside the iq moving body, an orifice passage is divided into a high pressure chamber and a low pressure chamber provided with pressure oil supply/discharge 11 via a D'+n saw plunger, and the orifice passage is always closed in this high pressure chamber. An energized check ball is installed inside the cylinder, and a red cylinder actuated by an electromagnetic mechanism to press the check ball is provided in the low pressure chamber, and a cylinder reduction switch is connected to a power source and controls energizing and de-energizing the electromagnetic mechanism. is provided, and when the passage is closed by a cylinder reduction switch, the electromagnetic mechanism is energized to press the check ball via the rod, and the pressure oil in the high pressure chamber is discharged to the low pressure chamber side. A variable displacement engine, characterized in that at least one of the through hole formed in the sleeve and the rod inserted through the through hole is provided with a mechanism for shutting off pressure oil flowing through the through hole. Valve stop device for a variable displacement engine according to claim 1, characterized in that the cut-off mechanism is provided with four parts in a part of the red valve. 3. The valve stop device for a phase-variable displacement engine according to claim 1, wherein a red shut-off plate is provided as the shut-off mechanism.